Well-drill pitman bearing



July 31, 1928. 1,679,077 w. H. FENNEMAN WELL DRILL PITMAN BEARING Patented July 31, 1928.

UNITED STATES WILLIAM H. runner/IAN, or ram,

CALIFORNIA, ASSIGNOR To MARY KATHERINE FENNEMAN'.

WELL-DRILL PITIVIAN BEARING.

Application filed. April 16, 1927. Serial No. 184,371;

This invention relates to new and useful improvements in well drilling machinery, and particularly to the pitmen thereof.

One object of the invention is to improve .the construction of the wrist-pin bearing of the pitman, whichenables the operator to more easily and quickly remove the pitman .from the wrist-pin.

Another object is to provide means for securely holding the upper bearing in engagement with the wrist-pin, and wherein the manipulating means for such holding means is so formed that danger of pinching thefingers is obviated, and danger of the jerkline catching on such means is prevented. V

A further object is to provide means for raising and lowering the upper bearing block whereby to prevent any tendency of such block to bind in its guide.

A still further object is to provide a sup- .port for the bearing blocks which is removable from the pitman frame.

Other objects and advantages will be ap ,parent from the following description when taken in connection with the accompanying drawing In theidrawing: c

Figure 1 is an elevation of the lower portion of a drilling machine pitman, showing the invention applied thereto.

Figure 2 is an enlarged vertical central sectional view on the line 2-2 of Figure 1.

Figure 3 is a horizontal sectional view on the line 33 of Figure 1.

Figure 4 is a horizontal sectional view on the line 44 of Figure 1.

Referring particularly to the accompanying drawing, 10 represents the metal strap which forms the side portions of the pitman, and which strap is formed with a curved big-ht portion 11. Received within this bight portion 11 is a metal casting 12, and formed in the upper central portion of the casting is an upwardly opening angular recess 13, in the side walls of which are formed the longitudinally extending grooves 14. Formed transversely in the casting 12, directly below the recess 13, is a handle loop 15, which the operator is adapted to grasp to lift the casting from the bight of the strap, when necessary. The casting 12 is suitably ribbed, as shown in the drawing, whereby to produce strength therein. Disposed in the lower portion of the recess is nected to this end of the bar at 36. Formed through the sides of the'bight portion of the strap 10, the casting 12, and the lower-bearing block 16, is a bolt 19, one end of which is formed, with a 21 outwardly thereof. Straddling this eye 21 is the bifurcated end-.ota hand lever 22, a. pivot pin 23 being disposed throu h the lever and eye. Pivotally connectetf with the lever 22, outwardly otthe pivot of said lever, is an upwardly extending link 24, said link having adjustable connections 25, with the lower end of a second link 26. In the upper portion of the recess 13 there is disposed the upper bearing block 27, said block having a recess 28, in its lower face, similar to the recess 17, for embracing engagement with the upper portion of the wrist pin 29, and having the longitudinal ribs 30 engaged in the grooves 14, of the casting 12. Secured to the inner face of one side of the strap 10 is a bracket 31, and pivotally connected to said bracket is one end of a manipulating bar 32, said bar having its other end extended through a slot 33, formed in the other sideportion of the strap where it is formed with an eye 34 pivotally connected with the upper end of the before-mentioned link 32.is the lower end of a coil spring 35, which has its upper end secured to the side of the strap 10, said spring normally urging the bar 32 up wardly, as will readily be understood. The bar 32 is reduced in thickness downwardly toward its lower edge, and such lower edge is longitudinally curved or bowed, as shown on opposite sides ofthis lower edge portion of the bar 32 are the longitudinally extending ribs 37. Formed on the upper end of the upper bearing block 27 are the'upwardly extending, and propspaced, L-shaped lugs 38, which are arranged to straddle the lower portion of the bar 32, and rest on said ribs 37. The lower faces of the transverse portion of these L-shaped lugs are curved whereby to permit a rocking movement on the said ribs. Thus when the bar 32 is rocked upwardly or downwardly will be moved vertically in the recess with on its pivot the block 27 i shoulder 20, and an eye 26. Also conout any binding action therewith. The recesses of the bearing blocks 16 and 27 are properly lined with Babbitt metal, for contact with the wrist-pin. The upper block 27 is hollow, and has an opening 39 in one side of its upper end to provide for the introduction of lubricant.

It will be particularly noted that the pivotal connection between the link 24 and the lever 22 is such that when the lever is swung downwardly into a position against the side of the bight portion of the strap 10, the said pivotal connection will lie inwardly of the pivotal connection between the lever and the bolt 19, whereby said lever is properly held against accidental outward movement. This position of the lever places the spring under tension, and when the lever is swung outwardly away from the pitrnan, the spring will pull upwardly on thebar 82, whereby to elevate the upper block 27 to a suiiicient distance to free the same from the wrist-pin. The operator then grasps the handle 15, and lifts the pitman from the wristp'in. Upon restoring the pitinan to a position where the wrist-pin is properly seated in the recess of the lower block 16, the operator grasps the lever 22 and swings the same downwardly,

with the result that the upper block 27 is forced downwardly into engagement with the wrist-pin, said block being thus held by virtue of the off-center connections between the lever and the link 24:.

What is claimed is:

A pitman including a yoke, a block seated in the bight of the yoke and having an angular recess, a lower bearing block seated in the recess, a bolt disposed transversely through the yoke, the block and the bearing block, an upper bearing block disposed in the recess and having upwardly extending opposing L-shaped lugs on its upper end, the inner faces of the transverse portions of said lugs being inclined transversely of the lugs, a lever disposed through the arms of the yoke and having longitudinally extending tapered ribs engaged beneath the inclined portions of said L-shaped lugs, and means mounted on said bolts and operatively con nected with the said lever for moving the latter to engage and disengage the movable bearing block with respect to a crank pin.

In testimony whereof, I have aiiixed my signature.

WVILLIAM H. FENNEMAN. 

